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参数资料
| 型号： | DS2125+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC TERM SCSI ULT3 LVD/SE 48-LQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 类型： | SCSI，LVD，SE |
| 端子数： | 15 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
DS2125 Ultra3 LVD/SE SCSI 15-Line Terminator
5 of 7
Figure 2. SCSI Bus Configuration
Note: The following terms are used throughout this data sheet:
DIFFSENS: Refers to the SCSI bus signal.
DIFFSENSE: Refers to the DS2125 pin name and internal circuitry capable of driving the DIFFSENS line.
DIFF_CAP: Refers to the DS2125 pin name and internal circuitry relating to monitoring the DIFFSENS line.
DETAILED DESCRIPTION
The DS2125 combines LVD and SE termination with DIFFSENSE sourcing and detection. A bandgap reference is
fed into two amplifiers, which creates a 1.25V reference voltage and a 2.85V reference voltage. The control logic
determines which of these references are applied to the termination resistors. If the SCSI bus is in LVD mode, the
1.25V reference is used. If the SCSI bus is in SE mode, the 2.85V reference is used. That same control logic
switches in/out parallel resistors to change the total termination resistance accordingly. Finally, in SE mode the Rp
pins are switched to ground.
The DIFFSENSE circuitry decodes trinary logic. There is one of three voltages on the SCSI control line called
DIFFSENS. Two comparators and a NAND gate determine if the voltage is below 0.6V, above 2.15V, or in
between, which indicates the mode of the bus as SE, HVD, or LVD, respectively.
TERMPWR
4.7
F
0.1
F
DIFFSENSE
TPWR
ISO
VREF
DIFF_CAP
DIFFSENS
4.7
F
TPWR
ISO
VREF
DIFF_CAP
DIFFSENS
CONTROL LINES (15)
0.1
F
TPWR
ISO
VREF
DIFF_CAP
DIFFSENS
4.7
F
4.7
F
TPWR
ISO
VREF
DIFF_CAP
DIFFSENS
CONTROL LINES (15)
20k
20k
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2127 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Ultra3 LVD/SE SCSI 14-Line Terminator |
| DS2127/T&R | 制造商:Maxim Integrated Products 功能描述:14 LINE LVD/SE TERMINATOR T&R - Tape and Reel |
| DS2127+ | 功能描述:SCSI 接口集成电路 RoHS:否 制造商:Texas Instruments 工作电源电压:2.7 V to 5.25 V 电源电流:13 mA 最大工作温度:+ 70 C 最小工作温度:0 C 安装风格:SMD/SMT 封装 / 箱体:SSOP-36 封装:Tube |
| DS2127+T&R | 制造商:Maxim Integrated Products 功能描述:IC TERM SCSI LVD/SE 48-LQFP |
| DS2127+T&R | 功能描述:SCSI 接口集成电路 RoHS:否 制造商:Texas Instruments 工作电源电压:2.7 V to 5.25 V 电源电流:13 mA 最大工作温度:+ 70 C 最小工作温度:0 C 安装风格:SMD/SMT 封装 / 箱体:SSOP-36 封装:Tube |
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